Best Prediction Market Arbitrage Apps (2026)
Search for a prediction market arbitrage app and you may expect a single App Store download. The practical setup is split: use Predictefy's arbitrage view in a mobile browser to find and compare cross-venue opportunities, then use the official venue apps or websites to execute. This guide explains how to turn that browser-first workflow into a reliable phone setup.
The Short Answer
For cross-venue discovery on a phone, use Predictefy in mobile Safari or Chrome. When you find a candidate opportunity, confirm and execute each leg through the official Polymarket or Kalshi app or website. Add Predictefy to your home screen for faster access. Developers who need a custom workflow can also work with the venues' official APIs and SDKs.
This matters because arbitrage is time sensitive and phones are often where people first notice a gap. The useful question is how to combine multi-venue discovery, venue-specific execution and careful verification on a small screen.
Key Takeaways
- Use Predictefy as the primary browser-based view for finding and comparing cross-venue opportunities.
- Use the official Polymarket or Kalshi app or website to verify the market and execute each leg.
- Add Predictefy to your home screen for app-like access without installing a third-party scanner.
- Developers can use official venue APIs and SDKs to build custom alerts or execution workflows.
- Always recheck prices, available size, fees and settlement terms before acting on an alert.
Why a Browser-First Workflow Makes Sense
A cross-venue scanner is a data-dense product. It has to help you compare market wording, executable prices, available size and settlement terms across more than one venue. A browser gives Predictefy room to present that information in one interface and update it without requiring an app download.
Execution is a different job. Official Polymarket and Kalshi interfaces are the appropriate place to review a venue's live order book, account state and order controls. Keeping discovery and execution separate also makes it clearer where every number must be confirmed.
Developers who need automation have another route: the venues' official APIs and SDKs. That approach offers more control, but it also requires engineering work, authentication, rate-limit handling and careful market matching.
What Actually Works on a Phone
| Option | Primary role | Access | Best use on a phone |
|---|---|---|---|
| Predictefy | Cross-venue discovery | Mobile browser | Find and compare opportunities across supported venues |
| Polymarket | Venue execution | Official app or website, where available | Confirm the Polymarket market and place its leg |
| Kalshi | Venue execution | Official app or website, where available | Confirm the Kalshi market and place its leg |
| Official APIs and SDKs | Custom workflows | Developer integration | Build venue-specific monitoring, alerts or order tools |
| Manual alerts | Reminders and monitoring | Watchlists, venue notifications or a custom script | Prompt a fresh check in Predictefy and the official venues |
1. Predictefy: The Primary Mobile Discovery Tool
Predictefy brings supported prediction market venues into one browser interface, so you can review cross-venue differences without checking every venue from scratch. On a phone, open the arbitrage view in Safari or Chrome and use it as the starting point for the workflow.
When an opportunity appears, compare the exact outcome wording and open both official venue interfaces. Confirm that the resolution rules describe the same event, then recheck executable prices, available size and fees. A displayed spread is a lead to investigate, not a guarantee that both legs can still be filled.
This makes Predictefy the primary mobile discovery layer, while the venues remain the source of truth for account access, order entry and final execution.
2. Polymarket and Kalshi: Native Apps for Execution
Once Predictefy surfaces a candidate opportunity, use the official Polymarket or Kalshi app or website to inspect the venue-specific market and place the corresponding leg. These official interfaces complement Predictefy. They do not replace its cross-venue comparison role.
App availability depends on platform and jurisdiction, so follow the venue's official download links and confirm that the publisher is genuine. Keep authentication secure and never give venue credentials to an unverified scanner or app wrapper.
3. Official APIs and SDKs: Build a Custom Workflow
Developers who need custom monitoring or alerts can work with the official Polymarket and Kalshi APIs and SDKs. They can support venue-specific market lookup, order book monitoring and order workflows permitted by each venue.
This route requires more work than opening Predictefy in a browser. You need to manage authentication, rate limits, market identifiers and changes to venue documentation. Cross-venue matching is also a separate problem because similarly worded markets may settle under different rules.
A practical division is to use Predictefy for broad discovery, then use official venue interfaces or integrations for venue-specific confirmation and execution.
Make Predictefy Behave Like an App
This takes about fifteen seconds and closes most of the gap between a website and an app.
On iOS, open Predictefy in Safari, tap the share button, then Add to Home Screen. On Android, open it in Chrome, tap the three-dot menu, then Add to Home screen. This creates a direct shortcut so you can return to the arbitrage view quickly.
The shortcut is still a website rather than a native app. Browser behavior and notification support remain subject to your device and browser settings.
Scanning and Executing Are Different Problems
Worth separating, because the app situation differs completely between them.
Use Predictefy for cross-venue discovery, then use the official venue apps or websites for execution. Before placing either order, verify the exact market, outcome direction, resolution rules, current executable price, available size and applicable fees on both venues.
The practical limit is speed. A price can move after one leg fills, leaving the other leg exposed. Switching between two apps on a phone can be slower than using two desktop windows, so treat mobile as a convenient discovery and verification setup rather than assuming every displayed opportunity can be locked.
Use Manual Alerts Carefully
A manual alert can be a calendar reminder, a saved watchlist, an official venue notification or a custom script built with official APIs. Its purpose is to prompt a fresh check, not to certify that an opportunity remains executable.
When an alert fires, reopen Predictefy and both official venue interfaces, then repeat the market, price, liquidity, fee and settlement checks. Avoid unverified third-party apps that request venue credentials. Use official download pages and documentation when installing an app or creating an API integration.
Is there a prediction market arbitrage app?
Predictefy is browser-based rather than an App Store download. It runs in mobile Safari or Chrome, and adding it to your home screen creates fast app-like access. Use official Polymarket or Kalshi apps or websites for venue-specific execution.
What is the best prediction market arbitrage app?
Predictefy is the primary browser-based choice for finding and comparing cross-venue opportunities on a phone. Use official Polymarket or Kalshi apps or websites to confirm the markets and execute each leg.
Can you do prediction market arbitrage on your phone?
Yes. Use Predictefy in a mobile browser to find and compare a candidate opportunity, then confirm and execute each leg through the official venue apps or websites. Filling both legs can be slower on a phone, so recheck prices and available size immediately before acting.
Do arbitrage scanners send push notifications?
Use manual reminders, official venue notifications or a custom integration built with official APIs and SDKs. Any alert should prompt a fresh check in Predictefy and both official venue interfaces because prices, size and market status can change.
Are prediction market arbitrage apps on the App Store safe?
Verify the publisher, domain and download link before installing anything or entering credentials. Predictefy runs in the browser, while venue-specific execution should use official Polymarket or Kalshi apps and websites. Avoid unverified wrappers that request access to a venue account.
Conclusion
The strongest mobile setup starts with Predictefy in a browser for cross-venue discovery, then moves to official venue apps or websites for confirmation and execution. Add Predictefy to your home screen, keep the relevant venue interfaces ready and use manual alerts only as prompts to recheck live conditions. Developers can extend the workflow with official APIs and SDKs. Our guide to the best prediction market arbitrage tools explains the wider workflow, and the best prediction market app covers the venue apps themselves.